Mirror Multiple object or parent and sub meshes
You can transfer Modifier or &quot;Link&quot; them from one object to others.
By selecting multiple objects and pressing CTRL+L you get a menu that looks somewhat like this:

By clicking on modifiers, the modifiers of the last selected Object (your active Object) get copied over to the other selected objects. That way you can Setup one Object the way you want and just transfer the modifier to the other objects.